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Isothiazolothienopyridines have been prepared by a domino reaction (the SN2 reaction → the Thorpe-Ziegler reaction → the Thorpe-Guareschi reaction type) from disodium 4-cyanoisothiazole-3,5-dithiolate. By changing the order of addition of the alkylation reagents in the reaction with disodium 4-cyanoisothiazole-3,5-dithiolate both possible isomers of the isothiazolothienopyridines are synthesized. These isomers were further used in three-component domino reaction (the Knoevenagel reaction → the Michael reaction → the hetero-Thorpe-Ziegler reaction type) to obtain wide range of isomeric isothiazolothienopyranopyridines.

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